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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2813ac208617fccadb6e73570d0e1aa5c7abdb66cf73fe945dd76f1804989019' 
  AND token = 'tbsVTe4w6t1oxshADK6PycBoHYuZ4p7Rpz93lGqRr7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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