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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ae436647633b02c53ff7e35785fdb7949f74e85ac0affeeb97f6d643093950' 
  AND token = 'zLwl7Y8id9KzRPK4Kx44cLwockEpaX7T7X0hEk+6Yeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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