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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed27fd49fe8c5910f99a6785923aaffee0b06be3635549ce7d67f007843fea0' 
  AND token = '4sk1bIlXrqyNePg6LklQum6d3sinBgeKwMxzJTU9LF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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