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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2da37839412f675403e2f255a5a2b71ab6bec626ef9fae0de0639e264e2fe79' 
  AND token = '/vIMjHvHXCtB0dsKn2MxuBMsms7rU0EUjWvuhpsZjPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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