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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2093cf6f429a5c80f180559a6479b9ba65b5bbe7a2bc043c88f5dad9ed165a68' 
  AND token = 'EX+NpIV/E2FgNOTbCgTRR5vWfsvZeENRwZhIZrdK0lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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