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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa2e38c1da0359448cde026d30bb78439b4ae6fcd0448d65d67e25592ec9669' 
  AND token = '02kGIq5EycJ8N9khEIGFHVNgEwgxq7kjnzvqh16AFVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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