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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37d59ac87dd86e8bbcc2aa21b96a9edc309a7cd4e1a0a6a4d48db1b8b5a0d24' 
  AND token = '5lBJ1j4SJnkXrrtTvcASzO2F9XyXTPeKscniMhXQTz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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