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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97af6bc455437c7ba0488b66b47b22690b445772ba7c485b1f5d6fdf282a619' 
  AND token = 'p/1SLR/6VBcFZ8a63kbeFTsd9FyZBXTXeLHG2qg3LX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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