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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec00b9409083d96de00d45eeb15ac5db546e361312f96f9b1717ec9d59dc773' 
  AND token = '6W+GTLfWbzYQr7I4t2B2DKush6XsSZyIVca7yFjnwac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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