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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e4c98451a2f539a5f1380db913b76b548c68ceb18a92a6c8388b9072b3f061' 
  AND token = 'Uoz9081fGu/I9bfRueRw1ZMN0THSxq1+qegllqeh2L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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