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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37846c6cfea23e29c96fd0b3b8e9b02fca8c8aedb71e70bfb06a2b2c128743a2' 
  AND token = 'OucZ/Bm093rA4Te7xQgt32sdqChgP4lLskzWEVn2lHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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