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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05adedd98b303df9c065c0bc396880f22fd52072d7bee345ed6657ee81e45377' 
  AND token = 'b2vTGSZx166FER4j+M3iR7mKj/+tnCpRUN8NW6IXrHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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