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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bd3b4d33a8cf18273e9cf9e1802b11ae2508ec23acb6e0af6963ac37b3492f' 
  AND token = 'wSJOaQ/C3+kZMAz9XaP12AYhFRPIM3j6Ac5CUpTJTeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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