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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedb5678c055a38f3d6f53c72da186f70c305e34e85bf0c028619dcd39e12816' 
  AND token = '8NVA9MVWjpmCvjvoMNWIKMIPNOfRx//wutBVXsmFTF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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