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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f417d08ca08a1d8a743355af667dcd40430b4a33c05a84e8648f4e5cf1ede2' 
  AND token = 'A/Z+4SX20cI4B/eEa+HA65Lgr7Lj2h27kD/gl23zsJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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