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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3089d7c6449f97849d2377c6293be8155389020ed27af024c581898a1376e0f5' 
  AND token = '3fkHlx6iE869jMpLG3o6k6g52WXJnGStUE8bDSFInk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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