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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c1ec2b95e336c3de886dd87a52d546c5dddafbb5adf0011b251941a9db4432' 
  AND token = '7GbLKnwYYxS5c4aGJVOblMCZu1ibBQyfT2/j/wdklZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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