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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0677914d56f2b48414eb900711a59c256cb06e3809ba7ec4a68dd2eeb8e8a4a3' 
  AND token = '6Y2X+filAa6E3+8NJImpfRe/FQppwwUbJGbHYIecEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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