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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff373bc8a22138a6b0c120708668385200c98ba1b622ffd4b6f56722798247c' 
  AND token = 'Q/N8mgc2ZJ39iIRqnQWa4vsP2CaDjGFIh2Ey+71CO64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}