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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675a338b4f3b5175acd14b7d985d49ec413eaf7b6486d024cac8707b62cff31a' 
  AND token = 'OvZj8cK3NrJ0pyMYRgdgXWIsdM5XGeQM9EbHxiFz+4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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