SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bcb94c628c1d7248c1575df8036fb769db0a5595de4ba3e2d37ee391794a80' 
  AND token = 'b7Cb4Bx9MIBVLkaw8+gX7zivhrHSkq91X+QLjlwq/CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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