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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00306973dee7f962f2cc5feff35ca310f0e8ad7cc092b3130265316126ff2f64' 
  AND token = 'E4Rvs/WODD7Ao9brYs02p6y0nSBo9Vyqh0AZzxpsTUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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