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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ddee3987359ebe6db357c6b7087cb71b65a02ba865d3c1b6b57b3605ca8986' 
  AND token = 'pj3ZJI9500GRDj8YHpJM0GNirIcpPu5XGSFR0Cn/hic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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