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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4cdb846e92fba3074d196b4264eb566a9fdf56b34a06611aa46ce8ab81e1bb' 
  AND token = 'IbbjmA9eVmOWVgj9wwMTKz7FF8BSC10f9g27B3mW9ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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