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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b603b5ebf12d049207f8b6359c99a1611fe3e33520a2029795d071bfd7b5b30' 
  AND token = '+6guXqaJN+MhqQD7pH115+7VPhl7LMoaJeE9aldlCN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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