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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bda58f85744361eac7ae93d5fb4862448da36f96d90994c1389fb6a269bf585' 
  AND token = 'NG4G8NOnqUI8a8bJteISl/B6+PUfyX+NhFQVGlEcvR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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