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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef37342b81db0f999e43418d666c3d5f842a3c54b6ebba996dcf092c0cb3fbc1' 
  AND token = '5+htGIs+N8aLDL9FdzZBBMOEqlODl5eMmiegBQNky14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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