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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8866033ebae047d303ea02771e9dd1f84fb8319dffd5c5fd1a35696c179972' 
  AND token = 'LG/03oFNOkjpWTvMbTv8uGVHqmFKDdmKE6R9H6JvamA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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