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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722b6f5e2765ecd9a837f3cee6401a1dc936763f5629d25136c10d90c3bd93df' 
  AND token = '2vS9KztAqfG3sUI+AzOEhSqvo6rG8TkdRkgn6hRk3eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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