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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a486916fbe1765e7b5ba4aea1e4fc24155886ef7c8f389095a462d57a32cfa4' 
  AND token = '+UREZodcrRnje4KFs/zfZPrNme3hT4w3CZPxasMNIn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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