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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dabd25f7ef5a2f3be8af27d69e40bbadb42af594046af9fac228c0c72d7d28' 
  AND token = 'jP1LBvWr8UdrQ+83LwbwqiM7mS1Ql0dWfwU/J7Ls+pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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