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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4685a929a0982ae03c28cc6b845fcaf39e8ec431ad808890c3179e058645183e' 
  AND token = 'ETmWeOiNxO7tj1c6W21jtKM8Pi4L6BJm+gHECXaeXOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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