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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19321aae7b07a87f235009dc393309747062d8c8d19e409f855d889e4d42461a' 
  AND token = 'y77Mm5Yrbu7DOS8to4JPLkVYwUHbXr5MYX1QViQFysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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