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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b130956b64a7dbbdadfa328188b83d1db7e70853a4d1bc9d67530308bc88bdd' 
  AND token = '4IhRB9d8+bYoUMiCplfcsliCLNKI+Lks5rzKTzJ16JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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