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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d7852be96732094b6c4bca22c88b20cea69a30572dab1dfa023b1d21ffbb4c' 
  AND token = 'v3PdDYE6zVdXvDnNXCsCc1evHvkWQmrLu3GcW7T445M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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