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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd851328e68be1be8b144622bc06be4ba7f03a2063e04f94f0e24913b7a4306b' 
  AND token = 'GMgrTKOiCwXPh/sx5DEmXbXJpRoASSdM9YVov0UWnec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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