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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69041b94f6d979842ff32d0f0f76ef472c658fadc288c9fa1e4c31640bc170a9' 
  AND token = 'YTl20zn7wiKD6lcEOALaY1ztk2p2r7keGiEd3oHi9Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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