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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388c79bc4ff9a5ad53b55e59432024e360b639ff71bd7cee331f4003d3b1f5c0' 
  AND token = 'qiAbv0nBXpUKU6iylS1p1rHEfj0N4etMgJ8re9fuveQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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