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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d36c7a32229f0daae0f1f9ada93d7b65196e62d1f4bf908968f9c78371449e' 
  AND token = 'LJFyIqWsdr56M4hanbz3PgPNPCu1V0t5weIGd1JagEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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