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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7177de24a087c7d6af793831e5e03cd3d81881444f8ac1e8632480bba04a247f' 
  AND token = '2kB2gWsw7CwH8AToiBmwtBcJ4tS16ak/foM0quh9IG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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