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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ddf942969c8cf0cc7e1e39727cfb4d78fb98bf757469eec2ce299a3e0b886d' 
  AND token = 'sY6SyDlucAPT7artP2COdOBeL4o5imKHlQkJxwzHZVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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