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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34b6d0b921e48a7c1ba0664b1c1ea9904458f8c557b440a5f442b96a502a6e4' 
  AND token = '0Rs4LgkBoyQ+nYpN6ZAV5jctlOKD0hmBvNHEH0cjmrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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