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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834ca6ab4f44df4b376553ca377c262f77e03e2a9ceb64b20d841c2e0fd67559' 
  AND token = 'n6zaVdhg5XHT/ROUy2oHJDUDgGf1ZRaNjeDQTfyURD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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