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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d97973213dbf7537f78925bfa2a9b95fd813ff36a6359fbb000c2261a6e3bd9' 
  AND token = 'FCHd/xFko7YWHBx2b497qoLMx6ww/TPC54w+yJrtvlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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