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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd680c2ff6cc1d6bcfd39b0b69bb1001591f652a98b6c12d9d6dc5a307bf9d17' 
  AND token = '+nqEnuoIUifMQamjjsokGgb6YWrWsHgL81W227fNddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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