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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d150394c308fcf237c47ad3f85331f2e70339de5b00f830078d69e6c8c2dfa2' 
  AND token = 'PrMW2ru6olE13ES5zC5ggGTTIZx/ji7/AVwdqy31EfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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