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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1171d23a7cbc70c439ad00f24965a54b52bb0cf76500a26429755bc750eed9' 
  AND token = 'KU+PbOyYZma9I6hbzfRbiz2vM7notHrf0Bu+mbZXRCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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