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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013ae40722f21cc450164fd7d45df8d7b6d4cd15bca2c83c7c3c87f78ea98c8f' 
  AND token = 'y+fOm9gphzzR6RR/n0eBdnreTNnMRaeq0kkctfoUC1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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