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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a9ded98e7646b70e820a4afbf58de1ef50b2d2e0d9d95c79d17ddbdd70a697' 
  AND token = 'KmBmGgBdfvnkTegPIL+vwc7vDxU1Fu8BR/Kg1Og/Oy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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