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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997f6a62626550aca4f984ee785634dc5114fae14a8191c05e2ce8bce7b1d06f' 
  AND token = 'zhIkhaG5PGXxnJ/eD7Ao7k2tgH6OoIoB7Dy/hD/SeVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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