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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62aadd825454589cbbb6b330cd4adb3916df0eaf599d25f432c9f60fcd4f526' 
  AND token = '6FC6gjn+2MpdCF+vN9AlJslnzCFG0evUtzT7e5W8oJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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