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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22725f6231510f373d8dd840f2113319ec35d5dfaee0c4bd54e5056a5f3b5b3f' 
  AND token = '4lINAX3UIPQxfADXmJJwczUIwSsBzwQixK6UGU3D/Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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