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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab354c6cb0e0ed8a00adb618f3614f0962d1526985492c3077c9c5d07f27d718' 
  AND token = 'Ck3PUZv7e10aatdA0twm2teD8JDw2IHsYLSKwwAfXxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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