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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9248907f4896c4fee36658d53e993e935f54039494dc35ee6be0db91a7a8c384' 
  AND token = 'v1o3iQCmQaHfntjWv5FYP7XQy2C2Hzfm9+AKGchcQQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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