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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37de80afcd6a03fe03b1d9b89fb9d03e5851c0cf11b2bbf64434cec2a0c6ba19' 
  AND token = '6sjgd0BsO7LeGWbSuMejt9JCbnds/8LBtXDwgutXfck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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