Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcea31d6523e917473100e56e5d00f78ce39c5109dc9ad459eda94b2c406b72d' 
  AND token = '19drckK2iTBM+zEV08ynY21kkKbHHIXczwi1e0R3BlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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