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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24df2f704a13b1486c4793af98c56a26900fc7ef97a8ef7ca474a3ec6760ce3' 
  AND token = 'jO98MASD+425MAQowrVAeqnjVNojs/ZPENtVd1DYg+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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