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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da0660fb5d8ea5eba944e6e669eef98023b5a431227331fe58acc1b36f89998' 
  AND token = 'cQGJdkVBRgK75VWU7KzDoieMfQ80i4VsIgsTRZDODt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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