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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78096b107ea3727e4327b60d94302ffd3191b4b17a8ea981cd92fd19c115edf5' 
  AND token = 'N42m5Yhay/n/l9DTPbwpc+9vnVBpFAgh1W2Eko2CE3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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