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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d3a323a30a518f5203005dee4e232d2067b8c5c4acea17f5ac07b52036042c' 
  AND token = 'RLs13slnmQ6mob8LzCkaeIgp+0g0hMC6bJ2hi12PjBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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