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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f13ce9b69a44da1c4997dfe832ea2fc177e88b404da74b5c3d5831db3c4f1d1' 
  AND token = 'aEjTWtkLDm7EFwK2V9NFNnOCYD/kSVkx+oAeGiGhHR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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