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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bcdb63af29dcd7dc08fadbe3f1e7e989d54fdc07cdeb318e3d7316177f4b63' 
  AND token = 'hN/VgQsB0o9or1OzpgAW7OS51NjO+BywCWLxBAvigD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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