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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f940f398c9297354553e2c25fa413c25c1a224b8c99214f3c312ccbbc5d32e' 
  AND token = 'ypeqIeL2BGJPerZ4HYzOzWR4pWwG/9rl4S3Fbe/tPRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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