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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa56b83cc4ae925693a3e0a44715645b9f9ad758608adb4ee0e490c653e79de' 
  AND token = 'XBofyhwRORmQvEJbAwWlsbG8TzR7nAhtIF8i/0jaoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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