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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9c7c90f9683eeb9ddc8bb714c1ce7092b3b0ebfc6d50568a5215b8fc578f83' 
  AND token = '52M18is2bKYKuHBHcaMPUfhjEU5783YHZnCU+CDuTxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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