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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36804cd5caabb320b9060a1ca24ba9c9de8ce98b3103f166311338a9b3cd8ca4' 
  AND token = 'sQu+DeudW3aBnA0AqB9AYl6iYfjFDlNvDoH4sxhUmvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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