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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ad38f7bf2d8c376cb759cd39b0216ae53e678ed7e2082604f4e435222f6b36' 
  AND token = 'tv3hPLjD9F4a3GNoREeaYBCusG6xYc8DpoS9mIDz354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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