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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4153aeeee8d3032ca958c19b2a11d82c83102761d3d5d3ee0c17f26aeec330ff' 
  AND token = 'aQggI2S5WXaxfjYNcnVlYHnVXegK52eEXLeubhChktg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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