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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a722250392c9cad1e4512cb3d24996d2f06b3fef113b6cf705bf9b976bd5ff' 
  AND token = 'QzUYJjWBd+Wvrp3sf3zSt9yiVh5MTCf2ANR4P0svP2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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