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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c336d5a48f2dfbf7c4cd720607187c2532ecdc371cba1f290dd92ae8d87f91c' 
  AND token = 'V9VIiTapmWZRpDHrbWkaIV8ZHC3DU2G7WwOPITG3X7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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