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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a6e03ab93d607c018f5ff993c7602e86f34c75c5789d3d42dc045dd87f1af8' 
  AND token = 'HW/KNlI4nLrm5RaVsTKzAVO3A3MuC8Jatw634mmMjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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