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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324a80e3a6211fb45062732f517367cf21263c72ad1f3ed9918ae27ea69de85b' 
  AND token = 'qNYMkF3fhQTa+L8yh04s9ILACcr7HcS2okeK8AJTjOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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