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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9482ed88dfc65b35ac76e736270ad87bf5e2f731f4eebd2aabc9c90dd54f0c' 
  AND token = 'bti46b1wmZC8N2Pbq6IO6/8lABjRF14eX+XMGTMe/4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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