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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675da05db8db845cf389c456094af8c7eedfa34d2e5c945c0f198318cef2ad6d' 
  AND token = 'HVGu4fyj4R5S+TFuRyBC8s/hywKkKZii1bKlu6zklt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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