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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207066f1f3e2a578c0f4b438016d693e063e51c36546bf15ae28f0df47d33a04' 
  AND token = 'h4tr98nGAhldf1AWQ3hppExqcYFvHNscKWApfmDJO54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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