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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85d1f9996e64e298fc1e6c33a1c1ac8104549bdaa1b56a589ac18ed4a0e14db' 
  AND token = 'G0cxPyhDCZqsOJr0RFqroqwqposqnAm1hIVH1IOIjYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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