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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e24300505e598d5b037d743e7dcfafbc17ad7dff8c93edeca7c260d0aabd9f' 
  AND token = 'LNhS/kdEr/77bhdq94RIUg9LKvaxLNkT2JSiOjqSV58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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