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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c3057824dfe730dffe5fc49dee0e6fdda12752e5db2477fd568f7e82dc7a83' 
  AND token = 'ysg7vgQBV+7rbQGijNOlxdZ51xd9mTHIWqmkcJV0SWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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