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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1988c2005eb0ea828baf82ccecd295f388a1b82e75b3656cbb94e0ab4f99188f' 
  AND token = 'kE0EFkXFG8jYYdMzM2zl1OqvQFvgqDqOJhM+PL8u8DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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