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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7e875d26d98043d7dd73327e3072da5357dfefe46b15cdbc0d4bbbd21c54d5' 
  AND token = 'Nc2QkzM7jwwz6AMo6l8Bqb5s2sSu7uNonsYU8H9QmfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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