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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f35157f01ef63fcfb7d460f6da6007da6ba0e124aff450ce9d37d47bcdcd05' 
  AND token = 'vvi6/HaCbMJ/VuAl+cvydB8DdcOby/yhFWGo3yo0pso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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