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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca4676d1401f7d693e35502968ddc692cc633efe78fd65abe2430a94d04bdae' 
  AND token = '3eCQHGfNJNozIslE6c4V40sxuZTGJD3+9ShkSmQh2s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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