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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d97e212c2f3c920d487eb7e994349e0ddc023414a506135868bf3276e23d4db' 
  AND token = '+ki9ZT/Zy7g4qbnPxkIfNxeE63XSurWi60cyOHcpH6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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