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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896e6e63d82b097229c26987bcde31860991af3be51913b3aaceeb23c0b94b5e' 
  AND token = 'HUFN4wy49Se/zKwEqzIGM1fthBxbWE97x2pOz5db8ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00471

JSON explain

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